.page-about {
  background: var(--cream);
  color: var(--ink);
  padding-top: var(--h-header);
  --about-rail: 190px;
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .archive-hero a:focus-visible,
.page-about .export-panel a:focus-visible {
  outline: 2px solid var(--fluo);
  outline-offset: 3px;
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: 16px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--line);
}

.page-about .breadcrumb__list a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb__list a:hover {
  color: var(--orange);
  border-color: var(--orange);
}

/* 首屏 */
.page-about .archive-hero {
  position: relative;
  margin-top: 18px;
  padding: clamp(40px, 6vw, 88px) 0 clamp(38px, 5vw, 76px);
  background-color: var(--night);
  background-image:
    linear-gradient(var(--line-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-dark) 1px, transparent 1px);
  background-size: 64px 64px;
  color: var(--cream);
  overflow: hidden;
}

.page-about .archive-hero::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: min(420px, 52vw);
  aspect-ratio: 1;
  background: radial-gradient(circle at 40% 40%, rgba(226, 85, 43, 0.5), transparent 68%);
  pointer-events: none;
}

.page-about .hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .kicker {
  color: var(--fluo);
}

.page-about .hero-copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 7.2vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-about .hero-lede {
  margin-top: clamp(16px, 2.4vw, 26px);
  max-width: 42ch;
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.9;
  color: var(--cream-soft);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .archive-hero .btn--ghost {
  color: var(--cream);
  border-color: var(--line-dark);
}

.page-about .archive-hero .btn--ghost:hover {
  color: var(--night);
  background: var(--ice);
  border-color: var(--ice);
}

.page-about .hero-tags {
  border-top: 1px solid var(--line-dark);
  padding-top: 18px;
}

.page-about .hero-tags .annotation {
  writing-mode: horizontal-tb;
  letter-spacing: 0.22em;
  font-size: 11px;
  color: var(--ice);
}

.page-about .hero-tags ul {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .hero-tags li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--cream);
}

.page-about .hero-tags li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--orange);
}

/* 档案外壳与左侧刻度 */
.page-about .archive-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .archive-rail {
  display: none;
}

.page-about .archive-body {
  min-width: 0;
}

.page-about .section {
  padding: clamp(42px, 6vw, 82px) 0;
  border-top: 1px solid var(--line);
}

.page-about .archive-body > .section:first-child {
  border-top: 0;
  padding-top: clamp(34px, 4.5vw, 60px);
}

.page-about .sec-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 3.4vw, 44px);
}

.page-about .sec-num {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.2vw, 50px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--orange);
}

.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.6vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-about .sec-lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about p {
  line-height: 1.9;
}

/* 起点 */
.page-about .origin-grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .origin-copy p {
  margin: 0 0 16px;
  max-width: 36em;
  font-size: 16px;
}

.page-about .origin-copy p:last-child {
  margin-bottom: 0;
}

.page-about .figure {
  margin: 0;
}

.page-about .figure__media {
  border: 1px solid var(--line);
  background: var(--night);
  overflow: hidden;
}

.page-about .figure--slant .figure__media {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 26px));
}

.page-about .figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure__cap {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

/* 阶段轨道 */
.page-about .stage-track {
  display: grid;
}

.page-about .stage {
  position: relative;
  padding: 0 0 30px 26px;
  border-left: 1px solid var(--line);
  transition: background var(--dur) var(--ease);
}

.page-about .stage:last-child {
  padding-bottom: 0;
}

.page-about .stage::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 9px;
  width: 9px;
  height: 9px;
  background: var(--line);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .stage:hover::before {
  background: var(--orange);
  transform: scale(1.25);
}

.page-about .stage:target {
  background: linear-gradient(90deg, rgba(226, 85, 43, 0.1), transparent 72%);
}

.page-about .stage:target::before {
  background: var(--orange);
  transform: scale(1.35);
}

.page-about .stage-tag {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .stage h3 {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.3;
}

.page-about .stage p {
  margin: 0 0 12px;
  max-width: 38em;
  font-size: 15px;
}

.page-about .text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 3px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .text-link:hover {
  color: var(--orange);
  border-color: var(--orange);
}

/* 四步流程 */
.page-about .flow {
  position: relative;
}

.page-about .flow::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 14px;
  bottom: 16px;
  width: 1px;
  background: var(--line);
}

.page-about .flow-step {
  position: relative;
  padding: 0 0 26px 44px;
}

.page-about .flow-step:last-child {
  padding-bottom: 0;
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 15px;
  width: 26px;
  height: 1px;
  background: var(--line);
}

.page-about .flow-step::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 11px;
  width: 9px;
  height: 9px;
  background: var(--orange);
  transition: background var(--dur) var(--ease);
}

.page-about .flow-step:hover::after {
  background: var(--ice-deep);
}

.page-about .flow-idx {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
  margin-bottom: 4px;
}

.page-about .flow-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.35;
}

.page-about .flow-step p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
}

/* 覆盖网络 */
.page-about .network-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .network-copy p {
  margin: 0 0 16px;
  max-width: 36em;
  font-size: 16px;
}

.page-about .network-copy p:last-child {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.page-about .figure__media--tall {
  aspect-ratio: 3 / 4;
}

.page-about .figure__media--tall .figure__img {
  height: 100%;
}

.page-about .region-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .region-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 12px;
  background: var(--cream);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .region-cell:hover {
  background: var(--orange);
  color: var(--cream);
}

.page-about .region-name {
  font-size: 15px;
  letter-spacing: 0.02em;
}

.page-about .region-count {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  opacity: 0.6;
  transition: opacity var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .region-cell:hover .region-count {
  opacity: 1;
  color: var(--cream);
}

/* 团队 */
.page-about .team-block {
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

.page-about .team-stack {
  display: flex;
  height: 52px;
  border: 1px solid var(--line);
}

.page-about .team-stack span {
  display: block;
  height: 100%;
  border-right: 1px solid var(--cream);
  transition: filter var(--dur) var(--ease);
}

.page-about .team-stack span:nth-child(odd) {
  background: var(--ice-deep);
}

.page-about .team-stack span:nth-child(even) {
  background: var(--ice);
}

.page-about .team-stack span:last-child {
  border-right: 0;
}

.page-about .team-legend {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-legend li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 4px 8px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}

.page-about .team-legend .numeral {
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .team-copy p {
  margin: 0 0 16px;
  max-width: 38em;
  font-size: 15px;
}

.page-about .team-copy p:last-child {
  margin-bottom: 0;
}

/* 合作生态 */
.page-about .partner-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .partner-card {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--cream);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .partner-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.35;
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
}

.page-about .partner-card--dark {
  background: var(--ice-deep);
  color: var(--cream);
}

.page-about .partner-card:not(.partner-card--dark):hover {
  background: var(--ice);
  transform: translateX(4px);
}

.page-about .partner-note {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 46em;
  font-size: 14px;
  line-height: 1.9;
  color: var(--ink-soft);
}

/* 导出面板 */
.page-about .export-panel {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  padding: clamp(26px, 4vw, 52px);
  background: var(--night);
  background-image:
    linear-gradient(var(--line-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-dark) 1px, transparent 1px);
  background-size: 48px 48px;
  color: var(--cream);
}

.page-about .export-num {
  display: block;
  margin-bottom: 12px;
  -webkit-text-stroke: 1.5px var(--fluo);
}

.page-about .export-copy h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.2;
}

.page-about .export-copy p {
  margin: 0 0 14px;
  max-width: 38em;
  font-size: 15px;
  color: var(--cream-soft);
}

.page-about .export-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.4vw, 26px);
}

.page-about .export-panel .btn--ghost {
  color: var(--cream);
  border-color: var(--line-dark);
}

.page-about .export-panel .btn--ghost:hover {
  color: var(--night);
  background: var(--ice);
  border-color: var(--ice);
}

.page-about .export-fields {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  align-self: start;
}

.page-about .export-fields li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  background: rgba(23, 18, 16, 0.86);
  font-size: 13px;
  line-height: 1.7;
}

.page-about .export-fields .numeral {
  flex: 0 0 auto;
  min-width: 56px;
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--fluo);
  font-variant-numeric: tabular-nums;
}

.page-about .export-fields li span:last-child {
  color: var(--cream-soft);
}

/* 收尾 */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: clamp(34px, 5vw, 64px) 0;
  border-top: 1px solid var(--line);
}

.page-about .cta-copy h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.8vw, 30px);
  line-height: 1.25;
}

.page-about .cta-copy p {
  margin: 0;
  max-width: 44em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* 断点 */
@media (min-width: 620px) {
  .page-about .region-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .team-legend {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .network-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.6fr);
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .export-panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.55fr);
    align-items: end;
  }

  .page-about .hero-tags {
    border-top: 0;
    border-left: 1px solid var(--line-dark);
    padding-top: 0;
    padding-left: clamp(18px, 2.4vw, 28px);
  }
}

@media (min-width: 1024px) {
  .page-about .archive-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(24px, 3vw, 56px);
  }

  .page-about .archive-rail {
    display: block;
    position: sticky;
    top: calc(var(--h-header-sm) + 28px);
    align-self: start;
    padding-top: clamp(34px, 4.5vw, 60px);
  }

  .page-about .rail-title {
    margin: 0 0 16px;
    font-size: 11px;
    letter-spacing: 0.24em;
    color: var(--ink-soft);
  }

  .page-about .rail-list {
    position: relative;
    margin: 0;
    padding: 0 0 0 16px;
    list-style: none;
    display: grid;
    gap: 14px;
  }

  .page-about .rail-list::before {
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background: var(--line);
  }

  .page-about .rail-list a {
    display: flex;
    align-items: baseline;
    gap: 10px;
    color: var(--ink-soft);
    text-decoration: none;
    font-size: 13px;
    letter-spacing: 0.1em;
    transition: color var(--dur) var(--ease);
  }

  .page-about .rail-list a:hover {
    color: var(--orange);
  }

  .page-about .rail-num {
    font-family: var(--font-display);
    font-size: 12px;
    color: var(--orange);
    font-variant-numeric: tabular-nums;
  }

  .page-about .region-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .page-about .team-legend {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }

  .page-about .team-legend li {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }
}
<<<END>>>